Bicycle handlebar attachment unit



FIG. 1 is a front view of a bicycle handlebar attachment unit showing my new design;

FIG. 2 is a top view of the bicycle handlebar attachment unit;

FIG. 3 is a left side view of the bicycle handlebar attachment unit;

FIG. 4 is a bottom view of the bicycle handlebar attachment unit;

FIG. 5 is a rear view of the bicycle handlebar attachment unit;

FIG. 6 is a right side view of the bicycle handlebar attachment unit; and,

FIG. 7 is a perspective view of the bicycle handlebar attachment unit, the broken lines are shown for illustrative purposes only and form no part of the claimed design. 

The ornamental design for a bicycle handlebar attachment unit, as shown and described. 